JavaScript

Set the JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetProtectedHeader, which sets the integrity-protected header for a signer from a JsonObject. The header specifies the signature algorithm (alg).

Background. The protected header is covered by the signature, so it cannot be altered without invalidating the JWS. It is configured before creating the JWS.

Note

This example is intended for running within a Chilkat.Js embedded JavaScript engine. All Chilkat JavaScript examples require Chilkat v11.4.0 or greater.

JavaScript

var success = false;

var jws = new CkJws();

//  Build the JWS protected header.  The "alg" member names the signature algorithm.
var header = new CkJsonObject();
header.UpdateString("alg","HS256");

//  Set the protected header for signer index 0.  The protected header is integrity-protected: it is
//  covered by the signature.
success = jws.SetProtectedHeader(0,header);
if (success == false) {
    console.log(jws.LastErrorText);
    return;
}

console.log("Protected header set.");